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Rule Title: AMBIENT AIR QUALITY STANDARD FOR VISIBILITY
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Department: ENVIRONMENTAL QUALITY
Chapter: AIR QUALITY
Subchapter: Ambient Air Quality
 
Latest version of the adopted rule presented in Administrative Rules of Montana (ARM):

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17.8.221    AMBIENT AIR QUALITY STANDARD FOR VISIBILITY

(1) No person shall cause or contribute to concentrations of particulate matter such that the scattering coefficient of particulate matter in the ambient air exceeds the following standard:

(a) annual average: 3 x 10-5 per meter, annual average, not to be exceeded.

(2) The provisions of (1) are applicable only in Class I areas as are designated under the Montana Clean Air Act rules, Prevention of Significant Deterioration of Air Quality, (ARM Title 17, chapter 8, subchapter 8) on the effective date of this rule. Areas redesignated Class I subsequent to the effective date of this rule shall be subject to the provisions of (1) only upon a finding by the department that visibility is an important attribute of such area.

(3) Measurement method: For determining compliance with this rule, visibility shall be measured by the integrating nephelometer method, as more fully described in "Methods of Air Sampling and Analysis, Second Edition" (1977) Method No. 11203-03-76 T, as modified by the addition of a heated sample inlet line and green spectral sensitivity; or by an approved equivalent method.

 

History: 75-2-112, 75-2-202, MCA; IMP, 75-2-202, MCA; NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285; AMD, 2024 MAR p. 253, Eff. 2/10/24.


 

 
MAR Notices Effective From Effective To History Notes
17-432A 2/10/2024 Current History: 75-2-112, 75-2-202, MCA; IMP, 75-2-202, MCA; NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285; AMD, 2024 MAR p. 253, Eff. 2/10/24.
8/15/1980 2/10/2024 History: 75-2-111, 75-2-202, MCA; IMP, 75-2-202, MCA; NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285.
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